Diodes for 12v battery charging
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From: ian field on 1 Feb 2010 11:44 "Stumpy" <perilmung(a)spamnet.con> wrote in message news:tIOdnVYYR9lka_vWnZ2dnUVZ_uidnZ2d(a)earthlink.com... > > >> The higher the current rating of the Schottky diode, the lower will be >> the voltage drop at a certain current. Here is a diagram of a typical >> 200W computer supply: >> http://www.pavouk.org/hw/en_atxps.html >> >> The output rectifier is a D83-004 which is rated at 30A. At 6A, or 3A >> through each in parallel, the voltage drop is just about 0.35V. >> http://pdf1.alldatasheet.com/datasheet-pdf/view/61331/FUJI/ESAD83-004.html >> >> So it might be worthwhile to take apart some junk computer PSUs to get >> these diodes. However, you can get an MBR4060 from Mouser for $2.60 each. >> Dual 40A 60V. >> >> Another idea to try is a set of three relays which take turns connecting >> the regulator to each of the three batteries. And you can add a small >> diode and resistor across each contact so that bateries not directly >> connected will still get a trickle charge. At least in this way the >> charger/controller will be able to interact with the battery in the way >> it was designed. >> >> Paul > > Those relays sound like a fun project, but too sophisticated for me. > Where do you guys post diagrams of your circuits? If Sci. E. B. is text > only is there a companion group for binaries? > News:alt.binaries.schematics.electronic
From: Stumpy on 1 Feb 2010 13:27 > > I'll bet the relay project is something you could tackle, > with a little help. > > Regarding schematics, there are a number of possibilities: > http://tinypic.com/ > Spice lists > a.b.s.e (alt.binaries.schematics.electronic) > ASCII art > > For example here's ascii art showing the diode isolation you > mentioned: > > ------------ > | Solar +|------+--->|---[Battery1]---+ > | Controller | | | > | | +--->|---[Battery2]---+ > | Harbor | | | > | Freight | +--->|---[Battery3]---+ > | Model (?) | | > | -|----------------------------+ > ------------ > > Each approach has its pluses and minuses. For example > the ACSII art above must be viewed in fixed font such as > Courier. > > Ed Thanks, I'm going to try posting on A.B.S.E. with the same heading. It will just show up as a lame sketch without any explanation. How do you link posts without crossposting?
From: George Herold on 1 Feb 2010 22:37
On Feb 1, 10:50 am, "Stumpy" <perilm...(a)spamnet.con> wrote: > > The higher the current rating of the Schottky diode, the lower will be the > > voltage drop at a certain current. Here is a diagram of a typical 200W > > computer supply: > >http://www.pavouk.org/hw/en_atxps.html > > > The output rectifier is a D83-004 which is rated at 30A. At 6A, or 3A > > through each in parallel, the voltage drop is just about 0.35V. > >http://pdf1.alldatasheet.com/datasheet-pdf/view/61331/FUJI/ESAD83-004... > > > So it might be worthwhile to take apart some junk computer PSUs to get > > these diodes. However, you can get an MBR4060 from Mouser for $2.60 each. > > Dual 40A 60V. > > > Another idea to try is a set of three relays which take turns connecting > > the regulator to each of the three batteries. And you can add a small > > diode and resistor across each contact so that bateries not directly > > connected will still get a trickle charge. At least in this way the > > charger/controller will be able to interact with the battery in the way it > > was designed. > > > Paul > > Those relays sound like a fun project, but too sophisticated for me. Where > do you guys post diagrams of your circuits? If Sci. E. B. is text only is > there a companion group for binaries?- Hide quoted text - > > - Show quoted text - You can put your pictures/schematic up on some 'picture host', (I'm not sure what the right word is.)and post the link here. George H. |